Mold for making concrete articles



.Sept. 9 1924.

w. J. JAMISON MOLD FOR MAKING CONCRETE ARTICLES Filed Nov. 27. (1923William James Jamison INVENTOR;

animal-nay Patented Sept. 9, 1924.

WILLIAM JAMES J'AIVIISON, OF SEAFORD, VICTORIA, AUSTRALIA.

. MOLD FOR' MAKING CONCRETE ARTICLES.

Application filed November 2'7, 1923. Serial No. 677,216.

1 the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

My invention relates to molds for making structural articles of suitableplastic material or materials, including the making of hollow or solidplain or duplex concrete building blocks, of any predetermined forms andsizes, All suitable plastic material is for brevity hereinafter calledconcrete.

One object of my invention is to provide a. handy mold, having movablefittings all of which can be metal, and with which a concrete block canvbe made in a fraction of a minute. I

A further object of the invention is to so construct the mold that theblock when made can be promptly discharged, and thus allow the mold tobe quickly reused. The edges, corners, and faces of the finished blockswill, 30. under correct working conditions be free from breaks anddeformation, and will therefore have sharp angles where desired. Otherfeatures of the invention will become apparent as this specification isperused.

In the drawings herewith my tested construction is shown, but therecould be modifications of minor features, within the scope of my claims.

In these drawings Figure 1 is a perspec- 40 tive view of an empty moldready to receive concrete.

Figure 2 is a perspective view of the mold inverted and opened, andcontaining a con crete block (a corner of which is visible) which isabout to be discharged.

Figure 3 is a longitudinal section of the inverted opened moldcontaining a block.

Figure & is similar to Figure 3,.except that the mold is fitted withmembers to form a duplex block. 7

Figure 5 is a plan of a mold fitted'with members to form a duplex block,some of the.

concrete being shown filled in.

Figure 6 is a fragmentary plan of a mold having fittings to form aduplex corner block, some of the. concrete being shown filled in.

Figure? is a side sectional elevation of a mold fitting having limbswhich being unrestricted are shown sprung open I Figures 8, 9 and 10areplans of, respectively, an apertured block, a duplex block,

and a duplex corner block, all of known,

forms. Apertured blocks may have one: or more holes.

Figure l1 is an end sectional View, of a duplex block.

Figure 12 is, a; side view of another mold fitting. Figure 13 moldbottom.

The mold has a bottom 'l, sides, 2, and

s a pe p ctiv ew oi. he

or surfaces of'the mold is or are fitted with a patterning plate 4, oris or are patterned,

so that the concrete block surface shall be of predetermined design.Inter-chan eable patterning means could be used wilhbu t patterningdevices are not part of this invention. h I i I To retain the sides andends in proper relatlve positions when the mold is closed as in F gure1, I provide, on ends 3, pro-v jections 12 between which the sidesfit.The

sides are held at and above their bases in working positions relativelyto the mold bottom, for which purpose strips 6 are connected to thesides and also to the bottom; and the ends 3 are held at and abovetheirbases in working position n tt nt he pen. bsition. h n n.

Figure 2.

xt r a y f. he. m ld id s and nds.

, r a ive y o l mold bottom by str ps. 5 which are conf provide members10, hereinafter termed wedges, and relatively thereto a draw framev 11,which embraces the wedges loosely or re ese ts tightly according to itsposition. The position of the frame will be, in the case illustrated,regulated by hand.

When drawn toward the wider ends of the wedges the frame forces theminwardly, causing the mold to close, as in Figure 1, in which positionthe spring strip tension is increased.

When the frame is drawn toward the narrow ends of the wedges, the sidesand ends, owing to the action of the spring strips, diverge so as toopen more widely the mouth of the mold, and so as to move away from theside and end surfaces of the concrete block.

Draw frame movement in each direction is limited thus the wedges arelimits as to one direction, and as to the opposite direction, stops,shown as mold lifting handles 13 on ends 3 act as limits. I

For forming an apertured block, the

bottom 1 is apertured; and assuming that the block to be made is thatmarked 17 the bottom has openings 1 ,shown flanged in Figure 13. Theseopenings permit of insertion and retraction through them of cores 14:,which are carried by a plate 15 hereinafter termed the mold floor, whichis connected to the draw frame 11, the connecting means shown beingstraps 16 see Figures 1 and 2. The cores are suitably fastened to thefloor, one suitable means being the bolts Then a mold contains a newlyformed block 1'7, the mold will be inverted bv the operator, so that theblock face 17 will rest on a suitable support, and the operator willthen move the draw frame 11, see Figure 2, so that the mold sides andends will diverge from the block by spring influence. This motion of thedraw frame also raises the floor thus withdrawing cores 1%, the sides ofwhich are tapered to facilitate such withdrawal.

Upon the operator then lifting the whole mold to facilitate whichhandles 13 are provided, the block is discharged. Block 17 containsholes 18, but it is obvious that cavity blocks could be made eachcontaining only one aperture. It is also obvious that to make a solidblock cores would be dispensed with, and the surface of bottom 1 insteadof having holes 1 would be continuous or be fitted with a false bottom.

The duplex block 19 has a known form its opposed sections beingseparated by an air space 19, but being tied together, metal ties 2%being shown. To make block 19 it suffices to insert suitable cores orfittings in the mold.

Thus end cores 20 are secured to and extend from the mold ends,fastening bolts 21 being shown, and 22 is a middle core, which is shownas having a spring 23 the function of which is to spread oppositeportions or limbs of this core apart, as in Figure 7, so far as thespace in. the mold allows, .as when core 22 is inserted between cores 1%the space available is limited as seen in Figures 4: to 6.

When the mold is occupiedin orderfrom end to end by cores 20, 1 1, 22,14, and 20, there will result an air space 19 between block sections 19of Figure 9. In each core 20 and 22 I provide recesses 25 to receive andtemporarily support metal ties 241, parts of which, when the concrete isadded, become embedded in the latter as illustrated by Figure 11,intermediate parts of the ties crossing the air space 19 The block shownin Figure 10 is of known form. It has an angular section, and to mold itcores will be located according to Figure 6, so that one end core 20becomes a bridge which extends from a main core 1 1 to a mold side 2.

,It is obvious that instead of using the series of cores illustrated inFigures 5 and 6 there could be one large core, for example, as amechanical equivalent. It is also obvious that a plurality of blockscould be simultaneously moulded by modifying the core devices; and thatrelatively thin blocks could be moulded at will for use as tiles orslabs.

For brevity, in the claims, mold sides and ends are termed walls, asthey are not necessarily dissimilar in form and size and they are allalike in being enclosing means.

I claim 1. For concrete article making, a mold having a base, movablewalls extending from the base, means to draw the walls into closedpositions, the said means being capable of retraction, and spring meansto locate the walls in divergent positions when such retraction iseffected, the spring means comprising strips which cross under the base,cross one another, extend outside the walls, and are connected to thebase and walls. 4

2. For concrete article making, a mold having a base which is flanged,apertured, and gapped, movable walls extending from the base, means todraw the walls into closed positions, the said means being capable ofretraction, and spring means extending through the gaps and beingconnected to the base, to locate the walls in divergent positions whensuch retraction is effected.

3. For concrete article making, a mold having a base, movable wallsextending from the base, means to draw the walls into closed positions,the said means being capable of retraction, spring means to locate thewalls in divergent positions when such retraction is effected, a flooradjacent to the base, and, attached to the floor, connections to theretractable means.

4. For concrete article making, mold having a base, movable wallsextending from the base, means to draw the walls into closed positions,the said means being capab-le of retraction, spring means to locate thewalls in divergent positions when such retraction is effected and atleast one co-re extending into the mold and connected with theretractable means so that retraction of the latter will retract the coreor cores.

5. In a concrete article making mold, movable walls, means to close thewalls into moulding position, means to diverge the walls, a base,apertures in the base, movable cores of tapering form extending throughthe apertures, a central core between the movable cores said centralcore formed of opposed parts, and spring means which urge the opposedparts apart.

6. For concrete article making, a mold having a base, side and endwalls, wedges on each wall exterior, means which connect the wallsmovably to the base, a draw frame enclosing the wedges and which willclose the walls together by sliding along the wedges, the draw framebeing retractable to free the walls from the concrete article, springmeans to move the walls into divergent positions when the walls arefreed, a floor carrying a core or cores extending through the base intothe mold, and connections from the draw frame to the floor to cause thecore or cores to be retracted at the same time as the walls arediverged.

7 In a mold for concrete blocks, the combination with an aperturedbase'and divergable walls, of cores removably projecting through saidapertures, and means carried by said cores for holding said walls inclosed parallel position when said cores are in position.

8. In a mold for concrete blocks, the combination with an apertured baseand divergable walls, of cores removably projecting through saidapertures, resilient means carried by said walls for normally holdingthem in diverged position, and means. carried by said cores andcooperating with said first-named means for allowing simultaneouswithdrawal of the cores and divergence of the walls to discharge afinished a continuous core extending from one wall to another.

10. A mold for concrete blocks, as claimed in claim 6, in which saidwalls are provided with resilient means for normally holding themindiverged position.

12. A mold for concrete blocks as claimed in claim 6, includingresilient strap members comprising abody portion attached to the baseand upwardly extending'normallydivergent end portions attached to saidwalls to normally hold said walls in divergent position.

13. A mold for concrete blocks as claimed in claim 6, in which saidwalls are provided with Wedges, and in which said means comprises adraw-frame encircling the walls and engaging with said wedges.

14;. A mold for concrete blocks as claimed in claim 6, in which saidwalls are provided with wedges, and in which said means comprises adraw-frame encircling the: walls and engaging with said wedges, andincluding handle members on opposite walls adapted to limit the movementof said draw-frame.

15. A mold for concrete blocks as claimed in claim 6, in which saidwalls are provided with wedges, and in which said means comp-rises aplate carried by said cores, and a draw-frame carried by said plate andencircling said walls and engaging with said wedges.

16. A mold for concrete blocks as claimed in claim 6, in which saidwalls are provided with Wedges, and in which said means comprises aplate carried by said cores, and a draw-frame carried by said plate andencircling said walls and engaging with said wedges, said plate beingparallel to, and substantially of the same dimensions as, the base.

In witness whereof I have hereunto set my hand.

WILLIAM J AMES J AMISON Witness:

GEORGE G. TURRI.

